Option E looks correct for me.
(A) Many products that contain microelectronic components are now assembled completely by machine. (This will lead to more unemployment)
(B) Workers involved in the various aspects of the manufacturing processes that use microelectronic technology need extensive training. (Extensive training doesn't help much with the unemployment case or new job positions)
(C) It is difficult to evaluate numerically what impact on job security the introduction of microelectronics
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(A) Many products that contain microelectronic components are now assembled completely by machine. (This will lead to more unemployment)
(B) Workers involved in the various aspects of the manufacturing processes that use microelectronic technology need extensive training. (Extensive training doesn't help much with the unemployment case or new job positions)
(C) It is difficult to evaluate numerically what impact on job security the introduction of microelectronics
...